Bit-chuck and bit.



Mn HARDSCG. BIT CHUCK AND BIT. APPLAIUATION rum .T Aq. so, 1909.

www Jan. 4, i910.

uns @Partir Brr-CHUCK. .ann Brr.

Speccation of Letters Patent.

Application filed January 30, 1909. Serial No. 475,279. i

To uit whom it may concern:

Be it known that I, MARTIN Hannsoce, a citizen of the United States, residing at 0ttumwa, in the county of Vapello and State of Iowa, have invented certainnew and useiul Improvements in Bit-Chucks and Bits, of which the following is a specification. A

This invention relates to a bit chuck and bit adapted for use therein, more particulartir as applied to pneumatic drills vand hammers, although the chuck might be employed in other connections. i

The object of the invention is to provide a chuck which can be readily clamped onto a bit ot the proper formation, and. thereafter inserted and locked in position in the end of a pneumatic tool or similar implement in such manner as t-o prevent the bit from dropping out of the tool or implement, and at the saine time afford a space for the reciprocation of the bitn'hen actuated by a pneuinatio hammer.

Furtherobjects ot the invention are to provide a construction which will be simple and easy of application and removal, and which will be inexpensive and .at the same time strong and durable.

Further objects will appear from the detailed description of the invention, which consists in the features of lconstruction and combination of parts hereinafter described and claimed. v

ln the drawings, Figure 1 is a longitudi-e nal elevation of the bit and one section ot the chuck, showing the end of the pneumatic hauuuer casing in elevation; Fig. 2 a longi tudiual sectional elevation of the bit; Fig. :l a cross sectional View, taken on line 3-3 ot F ig. 1; Fig. 4 a similar view, taken on line 4 4 of. Fig. 1; and Fig. 5 a longitudinal sectional view of the'two chuck sections in clamping' position.

The chuck comprises two sections (3, each having a semi-cylindrical' external contour,

which Sections are adapted to lit together to inclose a bit 7,and when fitted to assume the external formation of a complete cylinder. Each of the sections is' provided with a flat inner face 8, having formed therein a halt cylindrical outer chamber 9 which merges into a vhalf cylindrical inner chamber 10 of lesser diameter than the outer chamber. The outer chamber, at its outer end, merges into a semi-cylindrical groove or channel 411, and the inner chamber, at its inner end, merges into a' V-sha-ped inner groove or channel 12.

1t. will. be understood that theterms .1 inne-rdf` and outer refer to the positionoccupied lby the parts when the chuck is insertedrin'" channels or grooves coperate with a tapered bore 17 which extends transversely through the walls of the recessed end of the casing le, so that when the parts are all in re ister a tapered pin 18 may be driven throug'the bore and through the channels, thereby unitv- Patented Jan. 4,

orrrcn f MARTIN HARDSOCG, OF OTUMWA, vIOW'A.

ing the two chuck sections together and holding them, as an inte ral structure, firmly and rigidly within the c ambered end of the cas-V ing.

rEhe chuck cooperates with abit 7-Whicl1, in the form shown, is'provided'with a square head 19 slidably' entered between the square channels 12 in the two chuck sections, which arrangement prevents rotationfof the bit and at the saine time permits'the reciprocation thereof. The square head merges into cylindrical port-ion 20 of suitable size to lie within the cylindrical inner chamber 10, and the portion 20 merges'into an enlarged; cylindrical tiange portion 21,. which is adapted to reciprocate withinv the outer chamber attorded by the half cylindrical recesses 9, and .serves as a stop or abutment to limit the reeiprocation of the bit. The flange portion 21 connects with and merges into a cylindrical shank 22 which tits within the recesses 11, and said shank portion terminates in a stem 23 of reduceddiameter, having a cutting end 24. The inner or enlarged end of the bit is provided with a cenf tral bore 25 which terminates in a reducedV air passage 26 adapted to discharge air under pressure near the cutting end of the bit, as shown in Fig; 2. Obviously, the cutting portion and interior arrangementofthe bit might be substantially changed or moditied lwithout affecting the operation of the chuck members. Y

1n inserting the bit, the chuck sections are 'positioned in register with one another and with the bit lyingr between the sections. Thereafter, the chuck as a Whole, with the A easily driven out oit/the tapered borey to release the parts When desired. In operation, the bit een freely move back end forth through a limited space, but will be held against accidental displacement by the flange 21, which is'of a size-to prevent the accidental discharge of the bitu The construction is an extremely simple one, and et the seme time aiords strength,

rigidity and durability, which are essentiel in the art to which the present .invention relatesl What' regard. as new and desire to secure by Letters Patent is? In combination with e tool easing having L z a :i recess in its end and a pm hole 1u its 'side well, e Chuck comprising two hnlveeor Sections recessed to form a chamber of enlarged 'dirurleter merging into channels of reduced diameter, and each having apin groove, th'e two grooves being 1n register, a blt of e slze to progect inwardly :md outwardly through the channels, and provided Wit-h an enlarged portion adapted to reciprocate Within the chamber, and a pin entered through the pin hole in the Wall ol'/ the tool eusing'and through the pin grooves in the sections or halves of the chuck for holdingthe Sections or halves of the Chuek together, and holding the Chuck a Whole in inserted position within the tool easing, substantially as described.

MARTIN HARDSOCG.

Witnesses z' H. D; ZOLLARS,

EMMET A. WORK. 

